Golang llvm.Int8Type函数代码示例

func (fr *frame) memsetZero(ptr llvm.Value, size llvm.Value) {
	memset := fr.runtime.memset
	ptr = fr.builder.CreateBitCast(ptr, llvm.PointerType(llvm.Int8Type(), 0), "")
	fill := llvm.ConstNull(llvm.Int8Type())
	size = fr.createZExtOrTrunc(size, fr.target.IntPtrType(), "")
	align := llvm.ConstInt(llvm.Int32Type(), 1, false)
	isvolatile := llvm.ConstNull(llvm.Int1Type())
	fr.builder.CreateCall(memset, []llvm.Value{ptr, fill, size, align, isvolatile}, "")
}

func (fr *frame) memcpy(dest llvm.Value, src llvm.Value, size llvm.Value) {
	memcpy := fr.runtime.memcpy
	dest = fr.builder.CreateBitCast(dest, llvm.PointerType(llvm.Int8Type(), 0), "")
	src = fr.builder.CreateBitCast(src, llvm.PointerType(llvm.Int8Type(), 0), "")
	size = fr.createZExtOrTrunc(size, fr.target.IntPtrType(), "")
	align := llvm.ConstInt(llvm.Int32Type(), 1, false)
	isvolatile := llvm.ConstNull(llvm.Int1Type())
	fr.builder.CreateCall(memcpy, []llvm.Value{dest, src, size, align, isvolatile}, "")
}

// interfaceMethod returns a function and receiver pointer for the specified
// interface and method pair.
func (fr *frame) interfaceMethod(lliface llvm.Value, ifacety types.Type, method *types.Func) (fn, recv *govalue) {
	llitab := fr.builder.CreateExtractValue(lliface, 0, "")
	recv = newValue(fr.builder.CreateExtractValue(lliface, 1, ""), types.Typ[types.UnsafePointer])
	methodset := fr.types.MethodSet(ifacety)
	// TODO(axw) cache ordered method index
	index := -1
	for i, m := range orderedMethodSet(methodset) {
		if m.Obj() == method {
			index = i
			break
		}
	}
	if index == -1 {
		panic("could not find method index")
	}
	llitab = fr.builder.CreateBitCast(llitab, llvm.PointerType(llvm.PointerType(llvm.Int8Type(), 0), 0), "")
	// Skip runtime type pointer.
	llifnptr := fr.builder.CreateGEP(llitab, []llvm.Value{
		llvm.ConstInt(llvm.Int32Type(), uint64(index+1), false),
	}, "")

	llifn := fr.builder.CreateLoad(llifnptr, "")
	// Replace receiver type with unsafe.Pointer.
	recvparam := types.NewParam(0, nil, "", types.Typ[types.UnsafePointer])
	sig := method.Type().(*types.Signature)
	sig = types.NewSignature(nil, recvparam, sig.Params(), sig.Results(), sig.Variadic())
	fn = newValue(llifn, sig)
	return
}

func (fr *frame) compareStrings(lhs, rhs *govalue, op token.Token) *govalue {
	if op == token.EQL {
		if lhs.value.IsNull() {
			return fr.compareStringEmpty(rhs.value)
		}
		if rhs.value.IsNull() {
			return fr.compareStringEmpty(lhs.value)
		}
	}

	result := fr.runtime.strcmp.call(fr, lhs.value, rhs.value)[0]
	zero := llvm.ConstNull(fr.types.inttype)
	var pred llvm.IntPredicate
	switch op {
	case token.EQL:
		pred = llvm.IntEQ
	case token.LSS:
		pred = llvm.IntSLT
	case token.GTR:
		pred = llvm.IntSGT
	case token.LEQ:
		pred = llvm.IntSLE
	case token.GEQ:
		pred = llvm.IntSGE
	case token.NEQ:
		panic("NEQ is handled in govalue.BinaryOp")
	default:
		panic("unreachable")
	}
	result = fr.builder.CreateICmp(pred, result, zero, "")
	result = fr.builder.CreateZExt(result, llvm.Int8Type(), "")
	return newValue(result, types.Typ[types.Bool])
}

func (fr *frame) chanSelect(sel *ssa.Select) (index, recvOk *govalue, recvElems []*govalue) {
	n := uint64(len(sel.States))
	if !sel.Blocking {
		// non-blocking means there's a default case
		n++
	}
	size := llvm.ConstInt(llvm.Int32Type(), n, false)
	selectp := fr.runtime.newSelect.call(fr, size)[0]

	// Allocate stack for the values to send and receive.
	ptrs := make([]llvm.Value, len(sel.States))
	for i, state := range sel.States {
		chantyp := state.Chan.Type().Underlying().(*types.Chan)
		elemtyp := fr.types.ToLLVM(chantyp.Elem())
		if state.Dir == types.SendOnly {
			ptrs[i] = fr.allocaBuilder.CreateAlloca(elemtyp, "")
			fr.builder.CreateStore(fr.llvmvalue(state.Send), ptrs[i])
		} else {
			// Only allocate stack space if the received value is used.
			used := chanSelectStateUsed(sel, len(recvElems))
			if used {
				ptrs[i] = fr.allocaBuilder.CreateAlloca(elemtyp, "")
			} else {
				ptrs[i] = llvm.ConstNull(llvm.PointerType(llvm.Int8Type(), 0))
			}
			recvElems = append(recvElems, newValue(ptrs[i], chantyp.Elem()))
		}
	}

	// Create select{send,recv2} calls.
	var receivedp llvm.Value
	if len(recvElems) > 0 {
		receivedp = fr.allocaBuilder.CreateAlloca(fr.types.ToLLVM(types.Typ[types.Bool]), "")
	}
	if !sel.Blocking {
		// If the default case is chosen, the index must be -1.
		fr.runtime.selectdefault.call(fr, selectp, llvm.ConstAllOnes(llvm.Int32Type()))
	}
	for i, state := range sel.States {
		ch := fr.llvmvalue(state.Chan)
		index := llvm.ConstInt(llvm.Int32Type(), uint64(i), false)
		if state.Dir == types.SendOnly {
			fr.runtime.selectsend.call(fr, selectp, ch, ptrs[i], index)
		} else {
			fr.runtime.selectrecv2.call(fr, selectp, ch, ptrs[i], receivedp, index)
		}
	}

	// Fire off the select.
	index = newValue(fr.runtime.selectgo.call(fr, selectp)[0], types.Typ[types.Int])
	if len(recvElems) > 0 {
		recvOk = newValue(fr.builder.CreateLoad(receivedp, ""), types.Typ[types.Bool])
		for _, recvElem := range recvElems {
			recvElem.value = fr.builder.CreateLoad(recvElem.value, "")
		}
	}
	return index, recvOk, recvElems
}

// chanSend implements ch<- x
func (fr *frame) chanSend(ch *govalue, elem *govalue) {
	elemtyp := ch.Type().Underlying().(*types.Chan).Elem()
	elem = fr.convert(elem, elemtyp)
	elemptr := fr.allocaBuilder.CreateAlloca(elem.value.Type(), "")
	fr.builder.CreateStore(elem.value, elemptr)
	elemptr = fr.builder.CreateBitCast(elemptr, llvm.PointerType(llvm.Int8Type(), 0), "")
	chantyp := fr.types.ToRuntime(ch.Type())
	fr.runtime.sendBig.call(fr, chantyp, ch.value, elemptr)
}

func (fr *frame) makeInterfaceFromPointer(vptr llvm.Value, vty types.Type, iface types.Type) *govalue {
	i8ptr := llvm.PointerType(llvm.Int8Type(), 0)
	llv := fr.builder.CreateBitCast(vptr, i8ptr, "")
	value := llvm.Undef(fr.types.ToLLVM(iface))
	itab := fr.types.getItabPointer(vty, iface.Underlying().(*types.Interface))
	value = fr.builder.CreateInsertValue(value, itab, 0, "")
	value = fr.builder.CreateInsertValue(value, llv, 1, "")
	return newValue(value, iface)
}

func (fr *frame) createLandingPad(cleanup bool) llvm.Value {
	lp := fr.builder.CreateLandingPad(fr.runtime.gccgoExceptionType, fr.runtime.gccgoPersonality, 0, "")
	if cleanup {
		lp.SetCleanup(true)
	} else {
		lp.AddClause(llvm.ConstNull(llvm.PointerType(llvm.Int8Type(), 0)))
	}
	return lp
}

// resolveFunctionDescriptorGlobal returns a reference to the LLVM global
// storing the function's descriptor.
func (u *unit) resolveFunctionDescriptorGlobal(f *ssa.Function) llvm.Value {
	llfd, ok := u.funcDescriptors[f]
	if !ok {
		name := u.types.mc.mangleFunctionName(f) + "$descriptor"
		llfd = llvm.AddGlobal(u.module.Module, llvm.PointerType(llvm.Int8Type(), 0), name)
		llfd.SetGlobalConstant(true)
		u.funcDescriptors[f] = llfd
	}
	return llfd
}

func (u *unit) addGlobal(global llvm.Value, ty types.Type) {
	u.globalInits[global] = new(globalInit)

	if hasPointers(ty) {
		global = llvm.ConstBitCast(global, llvm.PointerType(llvm.Int8Type(), 0))
		size := llvm.ConstInt(u.types.inttype, uint64(u.types.Sizeof(ty)), false)
		root := llvm.ConstStruct([]llvm.Value{global, size}, false)
		u.gcRoots = append(u.gcRoots, root)
	}
}

// stringIterNext advances the iterator, and returns the tuple (ok, k, v).
func (fr *frame) stringIterNext(iter []*govalue) []*govalue {
	str, indexptr := iter[0], iter[1]
	k := fr.builder.CreateLoad(indexptr.value, "")

	result := fr.runtime.stringiter2.call(fr, str.value, k)
	fr.builder.CreateStore(result[0], indexptr.value)
	ok := fr.builder.CreateIsNotNull(result[0], "")
	ok = fr.builder.CreateZExt(ok, llvm.Int8Type(), "")
	v := result[1]

	return []*govalue{newValue(ok, types.Typ[types.Bool]), newValue(k, types.Typ[types.Int]), newValue(v, types.Typ[types.Rune])}
}

// makeMap implements make(maptype[, initial space])
func (fr *frame) makeMap(typ types.Type, cap_ *govalue) *govalue {
	// TODO(pcc): call __go_new_map_big here if needed
	dyntyp := fr.types.getMapDescriptorPointer(typ)
	dyntyp = fr.builder.CreateBitCast(dyntyp, llvm.PointerType(llvm.Int8Type(), 0), "")
	var cap llvm.Value
	if cap_ != nil {
		cap = fr.convert(cap_, types.Typ[types.Uintptr]).value
	} else {
		cap = llvm.ConstNull(fr.types.inttype)
	}
	m := fr.runtime.newMap.call(fr, dyntyp, cap)
	return newValue(m[0], typ)
}

func (fr *frame) registerGcRoots() {
	if len(fr.gcRoots) != 0 {
		rootty := fr.gcRoots[0].Type()
		roots := append(fr.gcRoots, llvm.ConstNull(rootty))
		rootsarr := llvm.ConstArray(rootty, roots)
		rootsstruct := llvm.ConstStruct([]llvm.Value{llvm.ConstNull(llvm.PointerType(llvm.Int8Type(), 0)), rootsarr}, false)

		rootsglobal := llvm.AddGlobal(fr.module.Module, rootsstruct.Type(), "")
		rootsglobal.SetInitializer(rootsstruct)
		rootsglobal.SetLinkage(llvm.InternalLinkage)
		fr.runtime.registerGcRoots.callOnly(fr, llvm.ConstBitCast(rootsglobal, llvm.PointerType(llvm.Int8Type(), 0)))
	}
}

// mapLookup implements v[, ok] = m[k]
func (fr *frame) mapLookup(m, k *govalue) (v *govalue, ok *govalue) {
	llk := k.value
	pk := fr.allocaBuilder.CreateAlloca(llk.Type(), "")
	fr.builder.CreateStore(llk, pk)
	valptr := fr.runtime.mapIndex.call(fr, m.value, pk, boolLLVMValue(false))[0]
	valptr.AddInstrAttribute(2, llvm.NoCaptureAttribute)
	valptr.AddInstrAttribute(2, llvm.ReadOnlyAttribute)
	okbit := fr.builder.CreateIsNotNull(valptr, "")

	elemtyp := m.Type().Underlying().(*types.Map).Elem()
	ok = newValue(fr.builder.CreateZExt(okbit, llvm.Int8Type(), ""), types.Typ[types.Bool])
	v = fr.loadOrNull(okbit, valptr, elemtyp)
	return
}

// chanRecv implements x[, ok] = <-ch
func (fr *frame) chanRecv(ch *govalue, commaOk bool) (x, ok *govalue) {
	elemtyp := ch.Type().Underlying().(*types.Chan).Elem()
	ptr := fr.allocaBuilder.CreateAlloca(fr.types.ToLLVM(elemtyp), "")
	ptri8 := fr.builder.CreateBitCast(ptr, llvm.PointerType(llvm.Int8Type(), 0), "")
	chantyp := fr.types.ToRuntime(ch.Type())

	if commaOk {
		okval := fr.runtime.chanrecv2.call(fr, chantyp, ch.value, ptri8)[0]
		ok = newValue(okval, types.Typ[types.Bool])
	} else {
		fr.runtime.receive.call(fr, chantyp, ch.value, ptri8)
	}
	x = newValue(fr.builder.CreateLoad(ptr, ""), elemtyp)
	return
}